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Frost dates for Pomona, California

In a typical year, Pomona’s last spring frost lands around Jan 8 and the first fall frost around Dec 28, a growing season of about 354 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 10a.

Right now the growing season is open, with about 64 days until the typical first fall frost.

Last spring frost and first fall frost odds for Pomona, California
OddsLast spring frostFirst fall frost
10 percentDec 14Dec 5
50 percentJan 8Dec 28
90 percentFeb 18Feb 2

A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.

Soil in Pomona is typically around 65°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.

Plantable now in Pomona

Timing comes from the same temperature engine the app uses, run against Pomona’s normals for today.

See the full what-to-plant lookup

Common questions

When is the last frost in Pomona, California?

Pomona’s last spring frost falls around January 8 in a typical year. One year in ten it is done by December 14, and one year in ten frost holds on until February 18. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Pomona?

The first fall frost arrives around December 28 in a typical year, as early as December 5 in an early year and as late as February 2 in a late one.

How long is the growing season in Pomona?

About 354 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Pomona in?

Pomona is in USDA hardiness zone 10a under the 2023 USDA Plant Hardiness Zone Map.

Dates come from 30-year NOAA climate normals for the nearest reporting station. They describe odds, not a forecast.

Nearby cities

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